Optical film, display device using the same, composition for forming ultraviolet absorbing layer used for producing optical film

Abstract

Provided are an optical film that can reduce reflectance, increase luminance, and reduce thickness of a display device, a display device using the optical film, and a composition for forming ultraviolet absorbing layer used for producing the optical film. An optical film characterized in that having a transparent substrate, a colored layer laminated on one side of the transparent substrate and containing a dye, and a functional layer laminated on the colored layer, in which the dye contains a first coloring material having a maximum absorption wavelength within the range of 470 to 530 nm, and a second coloring material having a maximum absorption wavelength in the range of 560 to 620 nm, and the functional layer includes an ultraviolet absorbing layer having an ultraviolet shielding rate of 85% or more, and the pencil hardness of the surface under a load of 500 g is H or higher.

1 . An optical film comprising
 a transparent substrate,   a colored layer laminated on one side of the transparent substrate and containing a dye, and   a functional layer laminated on the colored layer,   wherein   the dye contains   a first coloring material having a maximum absorption wavelength in the range of 470 to 530 nm and a half width of the absorption spectrum of 15 to 45 nm, and   a second coloring material having a maximum absorption wavelength in the range of 560 to 620 nm and a half width of the absorption spectrum of 15 to 55 nm,   and the functional layer includes an ultraviolet absorbing layer having an ultraviolet shielding rate of 85% or more according to JIS L 1925, and the pencil hardness of the surface under a load of 500 g is H or higher.   
     
     
         2 . The optical film according to  claim 1 , wherein the colored layer contains one or more of a radical scavenger, a peroxide decomposer, and a singlet oxygen quencher. 
     
     
         3 . The optical film according to  claim 2 , wherein the radical scavenger is a hindered amine light stabilizer having a molecular weight of 2000 or more. 
     
     
         4 . The optical film according to  claim 2 , wherein the singlet oxygen quencher is a transition metal complex of dialkyl phosphate, dialkyldithiocarbamate or benzenedithiol or similar dithiol. 
     
     
         5 . The optical film according to  claim 1 , wherein the functional layer includes an oxygen barrier layer having an oxygen barrier property with an oxygen permeability of 10 cc/m 2 *day*atm or less. 
     
     
         6 . The optical film according to  claim 1 , wherein
 the ultraviolet absorbing layer is a cured coating of a composition containing an energy ray-curable compound, a photopolymerization initiator, and an ultraviolet absorber,   the absorption wavelength range of the photopolymerization initiator in the ultraviolet region is different from the absorption wavelength range of the ultraviolet absorber in the ultraviolet region, and   the absorption wavelength range of the ultraviolet absorber in the ultraviolet region is in the range of 290 to 370 nm.   
     
     
         7 . The optical film functional layer according to  claim 1 , wherein the functional layer includes, in order from the colored layer side, the ultraviolet absorbing layer and a low refractive index layer having a lower refractive index than the ultraviolet absorbing layer. 
     
     
         8 . The optical film according to  claim 1 , wherein the functional layer includes, in order from the colored layer side, the ultraviolet absorbing layer and an antiglare layer. 
     
     
         9 . The optical film according to  claim 1 , wherein the ultraviolet absorbing layer is an antiglare layer containing an ultraviolet absorber. 
     
     
         10 . The optical film according to  claim 1 , wherein
 the functional layer includes, in order from the colored layer side, the ultraviolet absorbing layer and a low refractive index layer having a lower refractive index than the ultraviolet absorbing layer, and   the ultraviolet absorbing layer is an antiglare layer containing an ultraviolet absorber.   
     
     
         11 . The optical film according to  claim 1 , wherein the dye contained in the colored layer contains one or more compounds selected from the group consisting of compounds having any of a porphyrin structure, a merocyanine structure, a phthalocyanine structure, an azo structure, a cyanine structure, a squarylium structure, a coumarin structure, a polyene structure, a quinone structure, a tetraazaporphyrin structure, a pyrromethene structure and an indigo structure, and metal complexes thereof. 
     
     
         12 . The optical film according to  claim 1 , wherein the dye further contains a third coloring material having a maximum absorption wavelength within the range of 650 to 900 nm. 
     
     
         13 . A display device comprising the optical film according to  claim 1 . 
     
     
         14 . A composition for forming ultraviolet absorbing layer used for an optical film comprising
 a transparent substrate,   a colored layer laminated on one side of the transparent substrate and containing a dye, and   a functional layer laminated on the colored layer,   in which the dye contains   a first coloring material having a maximum absorption wavelength in the range of 470 to 530 nm and a half width of the absorption spectrum of 15 to 45 nm, and   a second coloring material having a maximum absorption wavelength in the range of 560 to 620 nm and a half width of the absorption spectrum of 15 to 55 nm,   and the functional layer includes an ultraviolet absorbing layer having an ultraviolet shielding rate of 85% or more according to JIS L 1925, and the pencil hardness of the surface under a load of 500 g is H or higher,   wherein   the composition for forming ultraviolet absorbing layer contains at least an active energy ray-curable resin, a photopolymerizable compound, an ultraviolet absorber, and a solvent,   the absorption wavelength range of the photopolymerization initiator in the ultraviolet region is different from the absorption wavelength range of the ultraviolet absorber in the ultraviolet region, and   the absorption wavelength range of the ultraviolet absorber in the ultraviolet region is in the range of 290 to 370 nm.